ENABLE_EXTENDED_FLAGS undeclared

Ok, so I acquire an older-model computer (Pentium4, 2GB of RAM), and of course it comes with Windows XP installed. What's one of the first things I try to do with it?

What would a normal person try to do with it? Maybe watch some YouTube videos, or check Yahoo Mail, something like that? Facebook?

I tried to do this:

I my defense, I already have a computer, which in the first place is several years newer (multi-core, 8GB of RAM about to be increased to 16 next time I'm willing to reboot it) and, additionally, runs a much better operating system. So if I wanted to do just regular stuff on the computer, I could do it on my main system. I got this other, older system, and my thinking is, while it still has the default Windows install on it, is there anything I want to try doing in Windows? And in that context, this is the answer I came up with: Didn't somebody on IRC say that building NetHack4 on Windows is broken right now? Maybe I should try that.